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Developmental changes in renal tubular function

L A Linday1

  • 1College of Physicians and Surgeons, New York, NY.

The Journal of Adolescent Health : Official Publication of the Society for Adolescent Medicine
|December 1, 1994
PubMed
Summary

Kidney function, measured by glomerular filtration rate, is fully developed by age one and declines after age 40. Understanding tubular secretion mechanisms is crucial for predicting drug interactions in children and adults.

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Area of Science:

  • Nephrology
  • Pharmacology
  • Pediatric Medicine

Background:

  • Standard renal function assessment uses glomerular filtration rate (GFR) adjusted for body size.
  • GFR indicates full renal capacity by one year of age, remaining stable until the fourth decade.
  • Age-related decline in GFR begins in the fourth decade of life.

Purpose of the Study:

  • To investigate developmental changes in renal tubular secretion and reabsorption.
  • To understand the mechanisms underlying drug interactions related to renal excretion.
  • To clarify the relationship between sexual maturation and drug clearance ratios in adolescents.

Main Methods:

  • Analysis of glomerular filtration rate (GFR) as a measure of renal function.
  • Evaluation of active tubular secretion and reabsorption of cations and anions.
  • Comparison of digoxin clearance to creatinine clearance ratios across age groups.

Main Results:

  • Developmental changes in net tubular secretion were observed for specific substances.
  • The ratio of digoxin clearance to creatinine clearance decreases from childhood to adulthood.
  • This decrease correlates better with sexual maturation than chronological age.

Conclusions:

  • Understanding renal tubular mechanisms is essential for predicting drug interactions.
  • Clarifying these mechanisms provides crucial clinical information for drug therapy.
  • Sexual maturation plays a significant role in the altered renal clearance observed in adolescents.

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